Vauxhall Astra Cabin Air Filter: Intervals, Fitment & Warning Signs

The cheapest, most overlooked part on this entire site — and one of the easiest to sort yourself.

Illustration for editorial purposes

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OEM Part Number: confirm via VIN — cabin air filter (aftermarket) Mahle LA1123 / Filtron K1343

Accuracy note: Covers the Vauxhall Astra (K 2015-2021) as listed in the UK aftermarket catalogues. A cabin filter is a cheap part, but it is bought by number, and the number depends on whether your car was built with a standard particulate filter or an activated-carbon one, as well as on trim and build date. The references below are aftermarket catalogue listings for this generation, grouped by brand; the carmaker's own number is not quoted in those listings, so check the genuine filter against your VIN if you want a guaranteed match. Carbon versions carry their own numbers and are listed separately.

Cabin filter, standard (aftermarket)	Mahle LA1123, Filtron K1343, Purflux AH732
Activated-carbon version (aftermarket)	Mahle LAK 1123, Filtron K 1343A, Purflux AHC732
Genuine (OE) number	Not quoted in the catalogue listings — the fitted filter varies by trim and build date, so order the genuine one against your VIN
Fitment notes	Standard and carbon filters have different numbers, and the right size depends on trim and build date. Check which type your car was built with before ordering.

Vauxhall Astra Cabin Air Filter: Easy to Forget, Easy to Fix

Of everything covered for the Vauxhall Astra, this is about as low-stakes mechanically as it gets — it doesn't touch how the car drives at all. Its only job is cabin air quality, which is exactly why owners tend to ignore it until something makes that hard to do.

Before you buy: filter size and whether your car uses a standard or activated-carbon filter varies by trim. Always confirm against your VIN before ordering.

Vauxhall Astra Cabin Air Filter: What It Does

On the Vauxhall Astra, this filter sits in the ventilation intake, not the engine bay, and cleans the air reaching the cabin — trapping dust, pollen, and on carbon-activated versions, some odours and pollutants too. The engine air filter is a completely different part, serving combustion rather than the cabin.

Vauxhall Astra Cabin Air Filter reference plate

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Vauxhall Astra Cabin Air Filter: Warning Signs, DIY Difficulty & Aftermarket Advice

These are the same regardless of make or model — see our full Cabin Air Filter Guide for signs it needs changing, confirming fitment against your VIN, and choosing standard, carbon, or HEPA media.

More Vauxhall Cabin Air Filter

The same part, covered across other Vauxhall models.